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RO Membrane Selection for Edinburg, TX Water

City of Edinburg Utilities Dept (supplemented by North Alamo WSC)
PWS ID: TX1080004
2025 water quality report

What's in Edinburg's Water

Reported values from City of Edinburg Utilities Dept (supplemented by North Alamo WSC)'s 2025 water quality data. Feed water chemistry drives membrane choice, operating pressure, and cleaning frequency.

Source water

Rio Grande River (Hidalgo County), raw-water reservoir at 3420 W. Freddy Gonzalez Dr; supplemented by purchased surface water from North Alamo WSC and McAllen Public Utility

Treatment

Chlorine dioxide primary disinfection; chloramines secondary; two conventional plants (West 16 MGD, Downtown 10 MGD)

Arsenic2 ppb
Barium0.117 ppm
Beta emitters6.6 pCi/L
Chloramines2.9 ppm
Cyanide50 ppb
Fluoride0.55 ppm
HAA525 ppb
Nitrate0.36 ppm
Selenium3.8 ppb
TTHM82 ppb
TTHM (range)33-82 ppb
TTHM violationMCL/LRAA exceedance Q1 2025 at DBP2-08 (37726 N Hwy 281)
Uranium2.5 µg/L

Our Recommendation for Edinburg

Edinburg is back in TTHM trouble: the 2025 report carries an active MCL violation - the locational running annual average topped the 80 ppb limit in the first quarter, reaching 82 ppb on the north side of the system. That is exactly the disinfection-byproduct problem reverse osmosis is built to solve. A brackish NanoH2O (formerly LG) BW 400 R G2 (99.8% rejection, fouling-resistant) with organic pretreatment strips the THM precursors along with the selenium and arsenic this Rio Grande supply carries; for any facility on Edinburg water that cannot tolerate THM excursions, on-site RO removes the variability the city is chasing with flushing.

Membranes Matched to This Water

The Industry Workhorse

NanoH2O (LG) BW 400 R G2

  • 99.8% salt rejection
  • 11,500 GPD · 225 psi
  • 400 ft² active area
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Running RO on Edinburg water?

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Data Source

Water quality values on this page are taken from City of Edinburg Utilities Dept (supplemented by North Alamo WSC)'s 2025 published water quality report (PWS ID TX1080004). Values are utility-wide averages; water at a specific site can vary. For membrane selection on a critical system, test your actual feed water.

View the official report